Collocations for staircase - noun

steep
broad, wide
narrow
elegant, grand, great
rickety
curving, spiral, sweeping, twisting, winding
moving
central, main
outside
back
marble, metal, stone, wooden

ascend, climb, mount
go up, run up, etc.
descend
go down, run down, etc.
take, use

lead to sth
The spiral staircase led to an upper gallery.

on the staircase
They passed each other on the staircase.

staircase to
the staircase to the main floor

the bottom of the staircase, the foot of the staircase, the top of the staircase